We propose zero-field depolarization measurements to investigate the motional dynamics of diamagnetic muonium centers in hafnium oxide (HfO2), tungsten oxide (WO3) and zirconium dioxide (ZrO2). In order to fully characterize the dynamics of positively charged centers in these oxides we plan a wide temperature scan from 10 to 800K. This would enable us to access the temperature regime where Mu+ is diffusively mobile so that the energy barrier for classical thermal motion can be determined from the fluctuation data. In our previous zero field muon spin depolarization experiments (RB1120279 and RB1110332) we have investigated several transparent conducting oxides including ZnO, Ga2O3, CdO, SnO2, and In2O3. Current proposal is an extension to these experiments and is also part of B. Baker's PhD project.